MSC Seminars

Variable Temperature Insert for RRR and thermometry measurements

Name: Variable Temperature Insert for RRR and thermometry measurements
Start: 2011-06-30T16:00:00+02:00
End: 2011-06-30T18:00:00+02:00
Location: CERN

by Vladimir Ivanovich Datskov (Dipartimento di Fisica-Universita degli Studi di Perugia-Univer)

Thursday 30 Jun 2011, 16:00 → 18:00 Europe/Zurich

112/R-034 (CERN)

112/R-034

CERN

Description

The seminar describes a new set-up that was developed for the fast measurement of the Residual Resistivity Ratio (RRR) for materials such as Nb3Sn and MgB2 that require stable temperature in the range of 20 to 40 K. The set-up uses a temperature controlled chamber, thermally anchored to a helium bath, that provides a stable temperature environment within minutes of setting. The accuracy was tested on a temperature reference block that can be used for calibration, and was found to be better than 10 mK, which is more than appropriate for RRR measurements. The advantage of a fast temperature setting is that resistance measurements can be taken on a given sample at several temperatures, allowing for a much better characterization of material properties. The same set-up can be used for the direct measurement of the resistive transition of superconductors. Measurement results from the commissioning tests are presented.